Chemically resistant silver alloy



Patented June 21, 193i v UNITED STATES PATENT OFFICE PETER ASSMANN, OF LUDW'IGSH AFEN-ON-THE-BHINE, GERMANY, ASSIGNOB TO I. G.

FABBENINDUSTRIE AKTIENGESELLSCHAFT, OF IRANKFOBT-ON-THE-MAIN, GER- MANY CHEMICALLY RESISTANT SILVER ALLOY 30 Drawing. Application filed December 24, 1929, Serial No. 416,298, and in Germany June 19, 1828.

The present invention relates to a chemically resistant silver alloy.

The present application is a continuation in part of the application for an im rove- 6 ment in Chemically resistant alloys Ser.

No. 199,403, filed June 16, 1927.

I have found that silver alloys consisting of at least 78 per cent of silver, from 0.3 to 20 per cent of manganese and from 0.3 w to 20 per cent of at least one metal selected from the roup of metals belonging to the second to fth group of the periodic system and capable of forming solid solutions rich in silver are considerably more resistant to corrosion than pure silver or the silver alloys hitherto marketed. Metals of the second to fifth group of the periodic system of the stated kind are for example aluminium, magnesium, zinc, tin, thallium, antimony, a0 arsenic, bismuth and silicon. The said al- 1oys are particularly resistant against hydrochloric acid in the dilute as well as in the concentrated state. Particularly valuable in this respect are the silver alloys containing from 2 to 20 per cent of manganese and from 0.3 to 6 per cent of aluminium. The said allo s are not necessarily produced from absoluteFy pure silver but the silver may contain such amounts of impurities as are usual- 1y present in silver.

Due to their resistivity against corrosion the alloys are most excellently adapted as materials for the production of receptacles and apparatus coming into contact with 3 chemical reagents, especially hydrochloric acid, and of silverware for general use. It is, however, in most cases not necessary to make the apparatus or receptacles throughout of the said silver alloys, but it is sufii- 4 cient to coat the surfaces exposed to attack with the said alloys.

What I claim is A silver alloy consisting of at least 78 per cent of silver, from 2 to 20 per cent of 5 manganese and from 0.3 to 6 per cent of aluminium.

In testimony whereof I have hereunto set my hand.

l0 PETER ASSMANN. 

